Rockwell Automation 1771-QDC, D17716.5.85(Passport) MNL. PLASTIC MOLDING MODULE User Manual
Page 43
Configure the QDC Module's I/O
Chapter 3
3-12
Determine Values for the Ram (Screw) Pressure Sensor
To complete the configuration for your ram (screw) pressure sensor, enter
on Worksheet 4-E minimum and maximum pressures and corresponding
signal levels from manufacturer’s specifications in MCC17-20. Most
applications require no further spanning. If your application requires
greater accuracy, follow the procedure below:
1.
Release system pressure to obtain minimum ram (screw) pressure.
2.
Read the pressure gauge at the ram (screw).
3.
Record minimum pressure (normally 0000) on line 5 for MCC17 on
Worksheet 4-E.
4.
With your programming terminal, read the signal level returned in
SYS34 (N40:186) from your pressure sensor. You may wish to zero
your pressure sensor at this time.
5.
Record this signal level on line 7 for MCC19. It should be at
minimum signal if you zeroed your pressure sensor in step 4.
ATTENTION: Use extreme caution during the next steps
because you stress the hydraulic system to its maximum rated
pressure. Loose fittings or faulty components could fail, causing
possible damage to equipment and/or injury to personnel.
6.
Re-torque all hydraulic connections and joints before proceeding.
7.
Boost system pressure to obtain maximum ram (screw) pressure.
Obtain maximum system pressure by positioning the ram (screw) at
its fully forward (nozzle end) or fully retracted (backpoint) position
while keeping its pressure valve in the maximum open position. This
forces the cylinder to press against the mechanical limits of its travel
and builds max system pressure.
8.
Read the ram (screw) pressure gauge. Do this while the ram (screw)
is mechanically bound from moving.
9.
Record this maximum pressure on line 6 for MCC18.
10.
With your programming terminal, read the signal level returned in
SYS34 (N40:186) from your pressure sensor. You may wish to span
your pressure sensor at this time.
11.
Record this signal level on line 8 for MCC20.
12.
Release pressure.